时间：2021-03-17 09:40:02 | 栏目：iOS代码 | 点击：次
1.首先，在需要实现的界面viewDidLoad中先保存亮度没有变化之前的亮度，因为这个界面消失之后还要变回原来的亮度,变化亮度也相当于用户的一种设置，所以也要保存一下这个状态，因为之后当APP在active和非active切换时候需要知道是否需要为用户做这个功能
// 保存原来的亮度 [[NSUserDefaults standardUserDefaults] setObject:@([UIScreen mainScreen].brightness) forKey:@"brightness"]; // 保存状态，需要为用户变化屏幕亮度功能 [[NSUserDefaults standardUserDefaults] setObject:@YES forKey:@"ifNeedChangeLight"];
2.在viewDidAppear中设置需要的亮度
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
if ([UIScreen mainScreen].brightness < 0.8) {
[UIScreen mainScreen].brightness = 0.8;
}
}
3.同理viewDidDisappear
- (void):(BOOL)animated
{
[super viewDidDisappear:animated];
// 还原
[UIScreen mainScreen].brightness = [[[NSUserDefaults standardUserDefaults] objectForKey:@"brightness"] floatValue];
[[NSUserDefaults standardUserDefaults] setObject:@NO forKey:@"ifNeedChangeLight"];
}
4.当从底部滑起操作栏和退出app到主界面需要进行恢复和设置相应操作
- (void)applicationWillResignActive:(UIApplication *)application {
if ([[[NSUserDefaults standardUserDefaults] objectForKey:@"ifNeedChangeLight"] boolValue]) {
[UIScreen mainScreen].brightness = [[[NSUserDefaults standardUserDefaults] objectForKey:@"brightness"] floatValue];
}
}
- (void)applicationDidBecomeActive:(UIApplication *)application {
if ([[[NSUserDefaults standardUserDefaults] objectForKey:@"ifNeedChangeLight"] boolValue]) {
if ([UIScreen mainScreen].brightness < 0.8) {
// 颜色需要渐变的话需要另外再写
[UIScreen mainScreen].brightness = 0.8;
}
}
}
5.如果需要亮度渐变效果网上有实现的函数，设置亮度直接调函数就可以了